气候变化领域集成服务门户(CCPortal): The impact of the stratospheric polar vortex shift on the arctic oscillation

CCPortal

DOI	10.1175/JCLI-D-20-0536.1
	The impact of the stratospheric polar vortex shift on the arctic oscillation
	Lu Y.; Tian W.; Zhang J.; Huang J.; Zhang R.; Wang T.; Xu M.
发表日期	2021
ISSN	08948755
起始页码	4129
结束页码	4143
卷号	34 期号:10
英文摘要	Using the ERA-Interim reanalysis dataset for the time period 1979–2016, we analyzed the influence of the stratospheric polar vortex shift on the Arctic Oscillation (AO) in winter (December–March). The results show that a shift in the stratospheric polar vortex toward the Eurasian continent is favorable for the occurrence of the negative phase of the AO. The duration of the AO events accompanied by the stratospheric polar vortex shift toward the Eurasian continent (AO-shift events) is longer than that of the remaining negative AO events (AO-noshift events), and the intensity of AO-shift events is greater than that of AO-noshift events from day 4 to day 15 of the life cycle of the events. The enhancement in the AO intensity during AO-shift events is likely due to downward extension of the stratospheric northern annular mode (NAM) signals and more poleward-propagating planetary waves in the troposphere and lower stratosphere and their convergence in the mid-high latitudes. Furthermore, the polar vortex shift can lead to changes in the intensity of the three action centers in the AO spatial pattern at 500 hPa. In general, during AO-shift events, the three action centers are stronger than those during AO-noshift events. There is an overall westward shift of the Arctic action center during AO-shift events, which may be closely related to the changes of Greenland blocking frequency. © 2021 American Meteorological Society.
英文关键词	Potential vorticity; Stratosphere–troposphere coupling; Stratospheric circulation
语种	英语
scopus关键词	Life cycle; Arctic Oscillation; Arctic oscillations; High Latitudes; Lower stratosphere; Northern annular mode; Planetary Waves; Spatial patterns; Stratospheric polar vortex; Vortex flow
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178573
作者单位	Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, China
推荐引用方式 GB/T 7714	Lu Y.,Tian W.,Zhang J.,et al. The impact of the stratospheric polar vortex shift on the arctic oscillation[J],2021,34(10).
APA	Lu Y..,Tian W..,Zhang J..,Huang J..,Zhang R..,...&Xu M..(2021).The impact of the stratospheric polar vortex shift on the arctic oscillation.Journal of Climate,34(10).
MLA	Lu Y.,et al."The impact of the stratospheric polar vortex shift on the arctic oscillation".Journal of Climate 34.10(2021).